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   1 /*********************************************************************
   2  *
   3  * Filename:      irlan_client.c
   4  * Version:       0.9
   5  * Description:   IrDA LAN Access Protocol (IrLAN) Client
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Aug 31 20:14:37 1997
   9  * Modified at:   Tue Dec 14 15:47:02 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  * Sources:       skeleton.c by Donald Becker <becker@CESDIS.gsfc.nasa.gov>
  12  *                slip.c by Laurence Culhane, <loz@holmes.demon.co.uk>
  13  *                          Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
  14  *
  15  *     Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
  16  *     All Rights Reserved.
  17  *
  18  *     This program is free software; you can redistribute it and/or
  19  *     modify it under the terms of the GNU General Public License as
  20  *     published by the Free Software Foundation; either version 2 of
  21  *     the License, or (at your option) any later version.
  22  *
  23  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  24  *     provide warranty for any of this software. This material is
  25  *     provided "AS-IS" and at no charge.
  26  *
  27  ********************************************************************/
  28
  29 #include <linux/kernel.h>
  30 #include <linux/string.h>
  31 #include <linux/errno.h>
  32 #include <linux/init.h>
  33 #include <linux/netdevice.h>
  34 #include <linux/etherdevice.h>
  35 #include <linux/if_arp.h>
  36 #include <linux/bitops.h>
  37 #include <net/arp.h>
  38
  39 #include <asm/system.h>
  40 #include <asm/byteorder.h>
  41
  42 #include <net/irda/irda.h>
  43 #include <net/irda/irttp.h>
  44 #include <net/irda/irlmp.h>
  45 #include <net/irda/irias_object.h>
  46 #include <net/irda/iriap.h>
  47 #include <net/irda/timer.h>
  48
  49 #include <net/irda/irlan_common.h>
  50 #include <net/irda/irlan_event.h>
  51 #include <net/irda/irlan_eth.h>
  52 #include <net/irda/irlan_provider.h>
  53 #include <net/irda/irlan_client.h>
  54
  55 #undef CONFIG_IRLAN_GRATUITOUS_ARP
  56
  57 static void irlan_client_ctrl_disconnect_indication(void *instance, void *sap,
  58                                                     LM_REASON reason,
  59                                                     struct sk_buff *);
  60 static int irlan_client_ctrl_data_indication(void *instance, void *sap,
  61                                              struct sk_buff *skb);
  62 static void irlan_client_ctrl_connect_confirm(void *instance, void *sap,
  63                                               struct qos_info *qos,
  64                                               __u32 max_sdu_size,
  65                                               __u8 max_header_size,
  66                                               struct sk_buff *);
  67 static void irlan_check_response_param(struct irlan_cb *self, char *param,
  68                                        char *value, int val_len);
  69 static void irlan_client_open_ctrl_tsap(struct irlan_cb *self);
  70
  71 static void irlan_client_kick_timer_expired(void *data)
  72 {
  73         struct irlan_cb *self = (struct irlan_cb *) data;
  74
  75         IRDA_DEBUG(2, "%s()\n", __func__ );
  76
  77         IRDA_ASSERT(self != NULL, return;);
  78         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
  79
  80         /*
  81          * If we are in peer mode, the client may not have got the discovery
  82          * indication it needs to make progress. If the client is still in
  83          * IDLE state, we must kick it to, but only if the provider is not IDLE
  84          */
  85         if ((self->provider.access_type == ACCESS_PEER) &&
  86             (self->client.state == IRLAN_IDLE) &&
  87             (self->provider.state != IRLAN_IDLE)) {
  88                 irlan_client_wakeup(self, self->saddr, self->daddr);
  89         }
  90 }
  91
  92 static void irlan_client_start_kick_timer(struct irlan_cb *self, int timeout)
  93 {
  94         IRDA_DEBUG(4, "%s()\n", __func__ );
  95
  96         irda_start_timer(&self->client.kick_timer, timeout, (void *) self,
  97                          irlan_client_kick_timer_expired);
  98 }
  99
 100 /*
 101  * Function irlan_client_wakeup (self, saddr, daddr)
 102  *
 103  *    Wake up client
 104  *
 105  */
 106 void irlan_client_wakeup(struct irlan_cb *self, __u32 saddr, __u32 daddr)
 107 {
 108         IRDA_DEBUG(1, "%s()\n", __func__ );
 109
 110         IRDA_ASSERT(self != NULL, return;);
 111         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 112
 113         /*
 114          * Check if we are already awake, or if we are a provider in direct
 115          * mode (in that case we must leave the client idle
 116          */
 117         if ((self->client.state != IRLAN_IDLE) ||
 118             (self->provider.access_type == ACCESS_DIRECT))
 119         {
 120                         IRDA_DEBUG(0, "%s(), already awake!\n", __func__ );
 121                         return;
 122         }
 123
 124         /* Addresses may have changed! */
 125         self->saddr = saddr;
 126         self->daddr = daddr;
 127
 128         if (self->disconnect_reason == LM_USER_REQUEST) {
 129                         IRDA_DEBUG(0, "%s(), still stopped by user\n", __func__ );
 130                         return;
 131         }
 132
 133         /* Open TSAPs */
 134         irlan_client_open_ctrl_tsap(self);
 135         irlan_open_data_tsap(self);
 136
 137         irlan_do_client_event(self, IRLAN_DISCOVERY_INDICATION, NULL);
 138
 139         /* Start kick timer */
 140         irlan_client_start_kick_timer(self, 2*HZ);
 141 }
 142
 143 /*
 144  * Function irlan_discovery_indication (daddr)
 145  *
 146  *    Remote device with IrLAN server support discovered
 147  *
 148  */
 149 void irlan_client_discovery_indication(discinfo_t *discovery,
 150                                        DISCOVERY_MODE mode,
 151                                        void *priv)
 152 {
 153         struct irlan_cb *self;
 154         __u32 saddr, daddr;
 155
 156         IRDA_DEBUG(1, "%s()\n", __func__ );
 157
 158         IRDA_ASSERT(discovery != NULL, return;);
 159
 160         /*
 161          * I didn't check it, but I bet that IrLAN suffer from the same
 162          * deficiency as IrComm and doesn't handle two instances
 163          * simultaneously connecting to each other.
 164          * Same workaround, drop passive discoveries.
 165          * Jean II */
 166         if(mode == DISCOVERY_PASSIVE)
 167                 return;
 168
 169         saddr = discovery->saddr;
 170         daddr = discovery->daddr;
 171
 172         /* Find instance */
 173         rcu_read_lock();
 174         self = irlan_get_any();
 175         if (self) {
 176                 IRDA_ASSERT(self->magic == IRLAN_MAGIC, goto out;);
 177
 178                 IRDA_DEBUG(1, "%s(), Found instance (%08x)!\n", __func__ ,
 179                       daddr);
 180
 181                 irlan_client_wakeup(self, saddr, daddr);
 182         }
 183 IRDA_ASSERT_LABEL(out:)
 184         rcu_read_unlock();
 185 }
 186
 187 /*
 188  * Function irlan_client_data_indication (handle, skb)
 189  *
 190  *    This function gets the data that is received on the control channel
 191  *
 192  */
 193 static int irlan_client_ctrl_data_indication(void *instance, void *sap,
 194                                              struct sk_buff *skb)
 195 {
 196         struct irlan_cb *self;
 197
 198         IRDA_DEBUG(2, "%s()\n", __func__ );
 199
 200         self = (struct irlan_cb *) instance;
 201
 202         IRDA_ASSERT(self != NULL, return -1;);
 203         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return -1;);
 204         IRDA_ASSERT(skb != NULL, return -1;);
 205
 206         irlan_do_client_event(self, IRLAN_DATA_INDICATION, skb);
 207
 208         /* Ready for a new command */
 209         IRDA_DEBUG(2, "%s(), clearing tx_busy\n", __func__ );
 210         self->client.tx_busy = FALSE;
 211
 212         /* Check if we have some queued commands waiting to be sent */
 213         irlan_run_ctrl_tx_queue(self);
 214
 215         return 0;
 216 }
 217
 218 static void irlan_client_ctrl_disconnect_indication(void *instance, void *sap,
 219                                                     LM_REASON reason,
 220                                                     struct sk_buff *userdata)
 221 {
 222         struct irlan_cb *self;
 223         struct tsap_cb *tsap;
 224         struct sk_buff *skb;
 225
 226         IRDA_DEBUG(4, "%s(), reason=%d\n", __func__ , reason);
 227
 228         self = (struct irlan_cb *) instance;
 229         tsap = (struct tsap_cb *) sap;
 230
 231         IRDA_ASSERT(self != NULL, return;);
 232         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 233         IRDA_ASSERT(tsap != NULL, return;);
 234         IRDA_ASSERT(tsap->magic == TTP_TSAP_MAGIC, return;);
 235
 236         IRDA_ASSERT(tsap == self->client.tsap_ctrl, return;);
 237
 238         /* Remove frames queued on the control channel */
 239         while ((skb = skb_dequeue(&self->client.txq)) != NULL) {
 240                 dev_kfree_skb(skb);
 241         }
 242         self->client.tx_busy = FALSE;
 243
 244         irlan_do_client_event(self, IRLAN_LMP_DISCONNECT, NULL);
 245 }
 246
 247 /*
 248  * Function irlan_client_open_tsaps (self)
 249  *
 250  *    Initialize callbacks and open IrTTP TSAPs
 251  *
 252  */
 253 static void irlan_client_open_ctrl_tsap(struct irlan_cb *self)
 254 {
 255         struct tsap_cb *tsap;
 256         notify_t notify;
 257
 258         IRDA_DEBUG(4, "%s()\n", __func__ );
 259
 260         IRDA_ASSERT(self != NULL, return;);
 261         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 262
 263         /* Check if already open */
 264         if (self->client.tsap_ctrl)
 265                 return;
 266
 267         irda_notify_init(&notify);
 268
 269         /* Set up callbacks */
 270         notify.data_indication       = irlan_client_ctrl_data_indication;
 271         notify.connect_confirm       = irlan_client_ctrl_connect_confirm;
 272         notify.disconnect_indication = irlan_client_ctrl_disconnect_indication;
 273         notify.instance = self;
 274         strlcpy(notify.name, "IrLAN ctrl (c)", sizeof(notify.name));
 275
 276         tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT, &notify);
 277         if (!tsap) {
 278                 IRDA_DEBUG(2, "%s(), Got no tsap!\n", __func__ );
 279                 return;
 280         }
 281         self->client.tsap_ctrl = tsap;
 282 }
 283
 284 /*
 285  * Function irlan_client_connect_confirm (handle, skb)
 286  *
 287  *    Connection to peer IrLAN laye confirmed
 288  *
 289  */
 290 static void irlan_client_ctrl_connect_confirm(void *instance, void *sap,
 291                                               struct qos_info *qos,
 292                                               __u32 max_sdu_size,
 293                                               __u8 max_header_size,
 294                                               struct sk_buff *skb)
 295 {
 296         struct irlan_cb *self;
 297
 298         IRDA_DEBUG(4, "%s()\n", __func__ );
 299
 300         self = (struct irlan_cb *) instance;
 301
 302         IRDA_ASSERT(self != NULL, return;);
 303         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 304
 305         self->client.max_sdu_size = max_sdu_size;
 306         self->client.max_header_size = max_header_size;
 307
 308         /* TODO: we could set the MTU depending on the max_sdu_size */
 309
 310         irlan_do_client_event(self, IRLAN_CONNECT_COMPLETE, NULL);
 311 }
 312
 313 /*
 314  * Function print_ret_code (code)
 315  *
 316  *    Print return code of request to peer IrLAN layer.
 317  *
 318  */
 319 static void print_ret_code(__u8 code)
 320 {
 321         switch(code) {
 322         case 0:
 323                 printk(KERN_INFO "Success\n");
 324                 break;
 325         case 1:
 326                 IRDA_WARNING("IrLAN: Insufficient resources\n");
 327                 break;
 328         case 2:
 329                 IRDA_WARNING("IrLAN: Invalid command format\n");
 330                 break;
 331         case 3:
 332                 IRDA_WARNING("IrLAN: Command not supported\n");
 333                 break;
 334         case 4:
 335                 IRDA_WARNING("IrLAN: Parameter not supported\n");
 336                 break;
 337         case 5:
 338                 IRDA_WARNING("IrLAN: Value not supported\n");
 339                 break;
 340         case 6:
 341                 IRDA_WARNING("IrLAN: Not open\n");
 342                 break;
 343         case 7:
 344                 IRDA_WARNING("IrLAN: Authentication required\n");
 345                 break;
 346         case 8:
 347                 IRDA_WARNING("IrLAN: Invalid password\n");
 348                 break;
 349         case 9:
 350                 IRDA_WARNING("IrLAN: Protocol error\n");
 351                 break;
 352         case 255:
 353                 IRDA_WARNING("IrLAN: Asynchronous status\n");
 354                 break;
 355         }
 356 }
 357
 358 /*
 359  * Function irlan_client_parse_response (self, skb)
 360  *
 361  *    Extract all parameters from received buffer, then feed them to
 362  *    check_params for parsing
 363  */
 364 void irlan_client_parse_response(struct irlan_cb *self, struct sk_buff *skb)
 365 {
 366         __u8 *frame;
 367         __u8 *ptr;
 368         int count;
 369         int ret;
 370         __u16 val_len;
 371         int i;
 372         char *name;
 373         char *value;
 374
 375         IRDA_ASSERT(skb != NULL, return;);
 376
 377         IRDA_DEBUG(4, "%s() skb->len=%d\n", __func__ , (int) skb->len);
 378
 379         IRDA_ASSERT(self != NULL, return;);
 380         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 381
 382         if (!skb) {
 383                 IRDA_ERROR("%s(), Got NULL skb!\n", __func__);
 384                 return;
 385         }
 386         frame = skb->data;
 387
 388         /*
 389          *  Check return code and print it if not success
 390          */
 391         if (frame[0]) {
 392                 print_ret_code(frame[0]);
 393                 return;
 394         }
 395
 396         name = kmalloc(255, GFP_ATOMIC);
 397         if (!name)
 398                 return;
 399         value = kmalloc(1016, GFP_ATOMIC);
 400         if (!value) {
 401                 kfree(name);
 402                 return;
 403         }
 404
 405         /* How many parameters? */
 406         count = frame[1];
 407
 408         IRDA_DEBUG(4, "%s(), got %d parameters\n", __func__ , count);
 409
 410         ptr = frame+2;
 411
 412         /* For all parameters */
 413         for (i=0; i<count;i++) {
 414                 ret = irlan_extract_param(ptr, name, value, &val_len);
 415                 if (ret < 0) {
 416                         IRDA_DEBUG(2, "%s(), IrLAN, Error!\n", __func__ );
 417                         break;
 418                 }
 419                 ptr += ret;
 420                 irlan_check_response_param(self, name, value, val_len);
 421         }
 422         /* Cleanup */
 423         kfree(name);
 424         kfree(value);
 425 }
 426
 427 /*
 428  * Function irlan_check_response_param (self, param, value, val_len)
 429  *
 430  *     Check which parameter is received and update local variables
 431  *
 432  */
 433 static void irlan_check_response_param(struct irlan_cb *self, char *param,
 434                                        char *value, int val_len)
 435 {
 436         __u16 tmp_cpu; /* Temporary value in host order */
 437         __u8 *bytes;
 438         int i;
 439
 440         IRDA_DEBUG(4, "%s(), parm=%s\n", __func__ , param);
 441
 442         IRDA_ASSERT(self != NULL, return;);
 443         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 444
 445         /* Media type */
 446         if (strcmp(param, "MEDIA") == 0) {
 447                 if (strcmp(value, "802.3") == 0)
 448                         self->media = MEDIA_802_3;
 449                 else
 450                         self->media = MEDIA_802_5;
 451                 return;
 452         }
 453         if (strcmp(param, "FILTER_TYPE") == 0) {
 454                 if (strcmp(value, "DIRECTED") == 0)
 455                         self->client.filter_type |= IRLAN_DIRECTED;
 456                 else if (strcmp(value, "FUNCTIONAL") == 0)
 457                         self->client.filter_type |= IRLAN_FUNCTIONAL;
 458                 else if (strcmp(value, "GROUP") == 0)
 459                         self->client.filter_type |= IRLAN_GROUP;
 460                 else if (strcmp(value, "MAC_FRAME") == 0)
 461                         self->client.filter_type |= IRLAN_MAC_FRAME;
 462                 else if (strcmp(value, "MULTICAST") == 0)
 463                         self->client.filter_type |= IRLAN_MULTICAST;
 464                 else if (strcmp(value, "BROADCAST") == 0)
 465                         self->client.filter_type |= IRLAN_BROADCAST;
 466                 else if (strcmp(value, "IPX_SOCKET") == 0)
 467                         self->client.filter_type |= IRLAN_IPX_SOCKET;
 468
 469         }
 470         if (strcmp(param, "ACCESS_TYPE") == 0) {
 471                 if (strcmp(value, "DIRECT") == 0)
 472                         self->client.access_type = ACCESS_DIRECT;
 473                 else if (strcmp(value, "PEER") == 0)
 474                         self->client.access_type = ACCESS_PEER;
 475                 else if (strcmp(value, "HOSTED") == 0)
 476                         self->client.access_type = ACCESS_HOSTED;
 477                 else {
 478                         IRDA_DEBUG(2, "%s(), unknown access type!\n", __func__ );
 479                 }
 480         }
 481         /* IRLAN version */
 482         if (strcmp(param, "IRLAN_VER") == 0) {
 483                 IRDA_DEBUG(4, "IrLAN version %d.%d\n", (__u8) value[0],
 484                       (__u8) value[1]);
 485
 486                 self->version[0] = value[0];
 487                 self->version[1] = value[1];
 488                 return;
 489         }
 490         /* Which remote TSAP to use for data channel */
 491         if (strcmp(param, "DATA_CHAN") == 0) {
 492                 self->dtsap_sel_data = value[0];
 493                 IRDA_DEBUG(4, "Data TSAP = %02x\n", self->dtsap_sel_data);
 494                 return;
 495         }
 496         if (strcmp(param, "CON_ARB") == 0) {
 497                 memcpy(&tmp_cpu, value, 2); /* Align value */
 498                 le16_to_cpus(&tmp_cpu);     /* Convert to host order */
 499                 self->client.recv_arb_val = tmp_cpu;
 500                 IRDA_DEBUG(2, "%s(), receive arb val=%d\n", __func__ ,
 501                            self->client.recv_arb_val);
 502         }
 503         if (strcmp(param, "MAX_FRAME") == 0) {
 504                 memcpy(&tmp_cpu, value, 2); /* Align value */
 505                 le16_to_cpus(&tmp_cpu);     /* Convert to host order */
 506                 self->client.max_frame = tmp_cpu;
 507                 IRDA_DEBUG(4, "%s(), max frame=%d\n", __func__ ,
 508                            self->client.max_frame);
 509         }
 510
 511         /* RECONNECT_KEY, in case the link goes down! */
 512         if (strcmp(param, "RECONNECT_KEY") == 0) {
 513                 IRDA_DEBUG(4, "Got reconnect key: ");
 514                 /* for (i = 0; i < val_len; i++) */
 515 /*                      printk("%02x", value[i]); */
 516                 memcpy(self->client.reconnect_key, value, val_len);
 517                 self->client.key_len = val_len;
 518                 IRDA_DEBUG(4, "\n");
 519         }
 520         /* FILTER_ENTRY, have we got an ethernet address? */
 521         if (strcmp(param, "FILTER_ENTRY") == 0) {
 522                 bytes = value;
 523                 IRDA_DEBUG(4, "Ethernet address = %pM\n", bytes);
 524                 for (i = 0; i < 6; i++)
 525                         self->dev->dev_addr[i] = bytes[i];
 526         }
 527 }
 528
 529 /*
 530  * Function irlan_client_get_value_confirm (obj_id, value)
 531  *
 532  *    Got results from remote LM-IAS
 533  *
 534  */
 535 void irlan_client_get_value_confirm(int result, __u16 obj_id,
 536                                     struct ias_value *value, void *priv)
 537 {
 538         struct irlan_cb *self;
 539
 540         IRDA_DEBUG(4, "%s()\n", __func__ );
 541
 542         IRDA_ASSERT(priv != NULL, return;);
 543
 544         self = (struct irlan_cb *) priv;
 545         IRDA_ASSERT(self->magic == IRLAN_MAGIC, return;);
 546
 547         /* We probably don't need to make any more queries */
 548         iriap_close(self->client.iriap);
 549         self->client.iriap = NULL;
 550
 551         /* Check if request succeeded */
 552         if (result != IAS_SUCCESS) {
 553                 IRDA_DEBUG(2, "%s(), got NULL value!\n", __func__ );
 554                 irlan_do_client_event(self, IRLAN_IAS_PROVIDER_NOT_AVAIL,
 555                                       NULL);
 556                 return;
 557         }
 558
 559         switch (value->type) {
 560         case IAS_INTEGER:
 561                 self->dtsap_sel_ctrl = value->t.integer;
 562
 563                 if (value->t.integer != -1) {
 564                         irlan_do_client_event(self, IRLAN_IAS_PROVIDER_AVAIL,
 565                                               NULL);
 566                         return;
 567                 }
 568                 irias_delete_value(value);
 569                 break;
 570         default:
 571                 IRDA_DEBUG(2, "%s(), unknown type!\n", __func__ );
 572                 break;
 573         }
 574         irlan_do_client_event(self, IRLAN_IAS_PROVIDER_NOT_AVAIL, NULL);
 575 }